Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
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/
\<elem\skey=\"fqdn\"\>(?<fullDomainName>[^\<]+)<\/elem\>
/
g
\< matches the character < literally (case sensitive)
elem matches the characters elem literally (case sensitive)
\s matches any whitespace character (equal to [\r\n\t\f\v ])
key= matches the characters key= literally (case sensitive)
\" matches the character " literally (case sensitive)
fqdn matches the characters fqdn literally (case sensitive)
\" matches the character " literally (case sensitive)
\> matches the character > literally (case sensitive)
Named Capture Group fullDomainName
(?<fullDomainName>[^\<]+)
Match a single character not present in the list below
[^\<]+
< matches the character < literally (case sensitive)
\/ matches the character / literally (case sensitive)
elem matches the characters elem literally (case sensitive)
\> matches the character > literally (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
g

Test String